Line data    Source code

       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2019-2021 Taler Systems SA
       4             : 
       5             :   TALER is free software; you can redistribute it and/or modify it
       6             :   under the terms of the GNU General Public License as published
       7             :   by the Free Software Foundation; either version 3, or (at your
       8             :   option) any later version.
       9             : 
      10             :   TALER is distributed in the hope that it will be useful, but
      11             :   WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13             :   GNU General Public License for more details.
      14             : 
      15             :   You should have received a copy of the GNU General Public
      16             :   License along with TALER; see the file COPYING.  If not, see
      17             :   <http://www.gnu.org/licenses/>
      18             : */
      19             : /**
      20             :  * @file curl/curl.c
      21             :  * @brief Helper routines for interactions with libcurl
      22             :  * @author Christian Grothoff
      23             :  */
      24             : #include "platform.h"
      25             : #include "taler_curl_lib.h"
      26             : 
      27             : 
      28             : #if TALER_CURL_COMPRESS_BODIES
      29             : #include <zlib.h>
      30             : #endif
      31             : 
      32             : 
      33             : enum GNUNET_GenericReturnValue
      34          12 : TALER_curl_easy_post (struct TALER_CURL_PostContext *ctx,
      35             :                       CURL *eh,
      36             :                       const json_t *body)
      37             : {
      38             :   char *str;
      39             :   size_t slen;
      40             : 
      41          12 :   str = json_dumps (body,
      42             :                     JSON_COMPACT);
      43          12 :   if (NULL == str)
      44             :   {
      45           0 :     GNUNET_break (0);
      46           0 :     return GNUNET_SYSERR;
      47             :   }
      48          12 :   slen = strlen (str);
      49          12 :   if (TALER_CURL_COMPRESS_BODIES &&
      50          12 :       (! ctx->disable_compression) )
      51             :   {
      52             :     Bytef *cbuf;
      53             :     uLongf cbuf_size;
      54             :     int ret;
      55             : 
      56          12 :     cbuf_size = compressBound (slen);
      57          12 :     cbuf = GNUNET_malloc (cbuf_size);
      58          12 :     ret = compress (cbuf,
      59             :                     &cbuf_size,
      60             :                     (const Bytef *) str,
      61             :                     slen);
      62          12 :     if (Z_OK != ret)
      63             :     {
      64             :       /* compression failed!? */
      65           0 :       GNUNET_break (0);
      66           0 :       GNUNET_free (cbuf);
      67           0 :       return GNUNET_SYSERR;
      68             :     }
      69          12 :     free (str);
      70          12 :     slen = (size_t) cbuf_size;
      71          12 :     ctx->json_enc = (char *) cbuf;
      72          12 :     GNUNET_assert (
      73             :       NULL !=
      74             :       (ctx->headers = curl_slist_append (
      75             :          ctx->headers,
      76             :          "Content-Encoding: deflate")));
      77             :   }
      78             :   else
      79             :   {
      80           0 :     ctx->json_enc = str;
      81             :   }
      82          12 :   GNUNET_assert (
      83             :     NULL !=
      84             :     (ctx->headers = curl_slist_append (
      85             :        ctx->headers,
      86             :        "Content-Type: application/json")));
      87             : 
      88          12 :   GNUNET_assert (CURLE_OK ==
      89             :                  curl_easy_setopt (eh,
      90             :                                    CURLOPT_POSTFIELDS,
      91             :                                    ctx->json_enc));
      92          12 :   GNUNET_assert (CURLE_OK ==
      93             :                  curl_easy_setopt (eh,
      94             :                                    CURLOPT_POSTFIELDSIZE,
      95             :                                    slen));
      96          12 :   return GNUNET_OK;
      97             : }
      98             : 
      99             : 
     100             : void
     101          12 : TALER_curl_easy_post_finished (struct TALER_CURL_PostContext *ctx)
     102             : {
     103          12 :   curl_slist_free_all (ctx->headers);
     104          12 :   ctx->headers = NULL;
     105          12 :   GNUNET_free (ctx->json_enc);
     106          12 :   ctx->json_enc = NULL;
     107          12 : }